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A082105 A symmetric square array of numbers, read by antidiagonals. 6
1, 1, 1, 1, 6, 1, 1, 13, 13, 1, 1, 22, 33, 22, 1, 1, 33, 61, 61, 33, 1, 1, 46, 97, 118, 97, 46, 1, 1, 61, 141, 193, 193, 141, 61, 1, 1, 78, 193, 286, 321, 286, 193, 78, 1, 1, 97, 253, 397, 481, 481, 397, 253, 97, 1, 1, 118, 321, 526, 673, 726, 673, 526, 321, 118, 1, 1, 141, 397 (list; table; graph; refs; listen; history; internal format)
OFFSET

0,5

COMMENTS

Rows include A028872, A082109. Main diagonal is A082106. Other diagonals include A047673. Diagonal sums (row sums if viewed as number triangle) are A082107

FORMULA

Square array defined by T(n, k)=(k^2n^2+4kn+1)

EXAMPLE

Rows start

1 1 1 1 1 ...

1 6 13 22 33 ...

1 13 33 61 97 ...

1 22 61 118 193...

1 33 97 193 321...

CROSSREFS

Cf. A082043, A082046.

Sequence in context: A202673 A202875 A203956 * A143210 A205133 A152238

Adjacent sequences:  A082102 A082103 A082104 * A082106 A082107 A082108

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Apr 03 2003

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Last modified February 16 02:30 EST 2012. Contains 205860 sequences.